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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements the visitor that computes the (line, column)-(line-column) range for each function.
package main
import (
"bufio"
"fmt"
"go/ast"
"go/build"
"go/parser"
"go/token"
"os"
"path/filepath"
"text/tabwriter"
"golang.org/x/tools/cover"
)
// funcOutput takes two file names as arguments, a coverage profile to read as input and an output
// file to write ("" means to write to standard output). The function reads the profile and produces
// as output the coverage data broken down by function, like this:
//
// fmt/format.go:30: init 100.0%
// fmt/format.go:57: clearflags 100.0%
// ...
// fmt/scan.go:1046: doScan 100.0%
// fmt/scan.go:1075: advance 96.2%
// fmt/scan.go:1119: doScanf 96.8%
// total: (statements) 91.9%
func funcOutput(profile, outputFile string) error {
profiles, err := cover.ParseProfiles(profile)
if err != nil {
return err
}
var out *bufio.Writer
if outputFile == "" {
out = bufio.NewWriter(os.Stdout)
} else {
fd, err := os.Create(outputFile)
if err != nil {
return err
}
defer fd.Close()
out = bufio.NewWriter(fd)
}
defer out.Flush()
tabber := tabwriter.NewWriter(out, 1, 8, 1, '\t', 0)
defer tabber.Flush()
var total, covered int64
for _, profile := range profiles {
fn := profile.FileName
file, err := findFile(fn)
if err != nil {
return err
}
funcs, err := findFuncs(file)
if err != nil {
return err
}
// Now match up functions and profile blocks.
for _, f := range funcs {
c, t := f.coverage(profile)
fmt.Fprintf(tabber, "%s:%d:\t%s\t%.1f%%\n", fn, f.startLine, f.name, 100.0*float64(c)/float64(t))
total += t
covered += c
}
}
fmt.Fprintf(tabber, "total:\t(statements)\t%.1f%%\n", 100.0*float64(covered)/float64(total))
return nil
}
// findFuncs parses the file and returns a slice of FuncExtent descriptors.
func findFuncs(name string) ([]*FuncExtent, error) {
fset := token.NewFileSet()
parsedFile, err := parser.ParseFile(fset, name, nil, 0)
if err != nil {
return nil, err
}
visitor := &FuncVisitor{
fset: fset,
name: name,
astFile: parsedFile,
}
ast.Walk(visitor, visitor.astFile)
return visitor.funcs, nil
}
// FuncExtent describes a function's extent in the source by file and position.
type FuncExtent struct {
name string
startLine int
startCol int
endLine int
endCol int
}
// FuncVisitor implements the visitor that builds the function position list for a file.
type FuncVisitor struct {
fset *token.FileSet
name string // Name of file.
astFile *ast.File
funcs []*FuncExtent
}
// Visit implements the ast.Visitor interface.
func (v *FuncVisitor) Visit(node ast.Node) ast.Visitor {
switch n := node.(type) {
case *ast.FuncDecl:
start := v.fset.Position(n.Pos())
end := v.fset.Position(n.End())
fe := &FuncExtent{
name: n.Name.Name,
startLine: start.Line,
startCol: start.Column,
endLine: end.Line,
endCol: end.Column,
}
v.funcs = append(v.funcs, fe)
}
return v
}
// coverage returns the fraction of the statements in the function that were covered, as a numerator and denominator.
func (f *FuncExtent) coverage(profile *cover.Profile) (num, den int64) {
// We could avoid making this n^2 overall by doing a single scan and annotating the functions,
// but the sizes of the data structures is never very large and the scan is almost instantaneous.
var covered, total int64
// The blocks are sorted, so we can stop counting as soon as we reach the end of the relevant block.
for _, b := range profile.Blocks {
if b.StartLine > f.endLine || (b.StartLine == f.endLine && b.StartCol >= f.endCol) {
// Past the end of the function.
break
}
if b.EndLine < f.startLine || (b.EndLine == f.startLine && b.EndCol <= f.startCol) {
// Before the beginning of the function
continue
}
total += int64(b.NumStmt)
if b.Count > 0 {
covered += int64(b.NumStmt)
}
}
if total == 0 {
total = 1 // Avoid zero denominator.
}
return covered, total
}
// findFile finds the location of the named file in GOROOT, GOPATH etc.
func findFile(file string) (string, error) {
dir, file := filepath.Split(file)
pkg, err := build.Import(dir, ".", build.FindOnly)
if err != nil {
return "", fmt.Errorf("can't find %q: %v", file, err)
}
return filepath.Join(pkg.Dir, file), nil
}
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